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Cheap flights from St. Louis to Sofia from $297

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 3/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:23 pm - 2:00 pm
STL
-
SOF
17h 37m
2 stops
Multiple Airlines Logo
7:00 am - 8:37 pm
SOF
-
STL
21h 37m
2 stops
$528Multiple Airlines
Tue, Apr 14 - Wed, Nov 18
British Airways Logo
6:11 pm - 8:30 pm
STL
-
SOF
42h 19m
2 stops
British Airways Logo
5:25 pm - 8:58 am
SOF
-
STL
47h 33m
2 stops
$533British Airways
Mon, Apr 13 - Mon, Nov 16
Multiple Airlines Logo
4:05 pm - 10:45 pm
STL
-
SOF
22h 40m
2 stops
Multiple Airlines Logo
2:15 pm - 1:55 pm
SOF
-
STL
31h 40m
1 stop
$535Multiple Airlines
Wed, Feb 18 - Tue, Mar 3
United Airlines Logo
8:41 am - 1:50 pm
STL
-
SOF
21h 09m
2 stops
United Airlines Logo
6:00 am - 10:14 pm
SOF
-
STL
24h 14m
3 stops
$542United Airlines
Wed, Feb 18 - Tue, Mar 3
United Airlines Logo
8:21 am - 11:10 pm
STL
-
SOF
30h 49m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$550United Airlines
Mon, Apr 13 - Fri, Apr 17
Lufthansa Logo
3:30 pm - 1:25 pm
STL
-
SOF
13h 55m
1 stop
Lufthansa Logo
6:10 am - 11:25 pm
SOF
-
STL
25h 15m
2 stops
$554Lufthansa
Wed, Apr 15 - Tue, Nov 17
Lufthansa Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Lufthansa Logo
6:10 am - 1:55 pm
SOF
-
STL
15h 45m
1 stop
$556Lufthansa
Wed, Apr 15 - Fri, Nov 6
United Airlines Logo
2:40 pm - 11:10 pm
STL
-
SOF
24h 30m
2 stops
United Airlines Logo
2:25 pm - 3:30 pm
SOF
-
STL
33h 05m
2 stops
$558United Airlines
Mon, Apr 13 - Tue, Nov 17
United Airlines Logo
7:45 am - 6:10 pm
STL
-
SOF
26h 25m
2 stops
United Airlines Logo
6:10 am - 1:55 pm
SOF
-
STL
15h 45m
1 stop
$562United Airlines
Sun, Apr 12 - Wed, Nov 4
United Airlines Logo
3:30 pm - 6:10 pm
STL
-
SOF
18h 40m
1 stop
United Airlines Logo
2:25 pm - 3:30 pm
SOF
-
STL
33h 05m
2 stops
$566United Airlines
Sun, Apr 12 - Thu, Nov 19

British Airways flights from St. Louis to Sofia

Our best British Airways deals on St. Louis to Sofia flight tickets
British Airways
Apr 13
STL6:11 pmLambert-St Louis
42h 19m
2 stops
SOF8:30 pmSofia
Nov 16
SOF5:25 pmSofia
47h 33m
2 stops
STL8:58 amLambert-St Louis
$533
British Airways
Apr 13
STL6:11 pmLambert-St Louis
42h 19m
2 stops
SOF8:30 pmSofia
Nov 7
SOF12:05 pmSofia
28h 05m
2 stops
STL8:10 amLambert-St Louis
$583

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Feb 18
STL8:41 amLambert-St Louis
21h 09m
2 stops
SOF1:50 pmSofia
Mar 3
SOF6:00 amSofia
24h 14m
3 stops
STL10:14 pmLambert-St Louis
$542
United Airlines
Apr 13
STL8:21 amLambert-St Louis
30h 49m
2 stops
SOF11:10 pmSofia
Apr 17
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$550
United Airlines
Apr 13
STL6:05 pmLambert-St Louis
21h 05m
2 stops
SOF11:10 pmSofia
Nov 20
SOF2:25 pmSofia
33h 05m
2 stops
STL3:30 pmLambert-St Louis
$558

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 14, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/14

12:23 pm-2:00 pm

2 stops17h 37m

Sofia

Wed 11/18

7:00 am-8:37 pm

2 stops21h 37m

$528

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 4/13

6:11 pm-8:30 pm

2 stops42h 19m

Sofia

Mon 11/16

5:25 pm-8:58 am

2 stops47h 33m

$533

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 2/18

4:05 pm-10:45 pm

2 stops22h 40m

Sofia

Tue 3/3

2:15 pm-1:55 pm

1 stop31h 40m

$535

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 2/18

8:41 am-1:50 pm

2 stops21h 09m

Sofia

Tue 3/3

6:00 am-10:14 pm

3 stops24h 14m

$542

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 4/13

8:21 am-11:10 pm

2 stops30h 49m

Sofia

Fri 4/17

6:20 am-1:25 pm

1 stop15h 05m

$550

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/15

3:30 pm-1:25 pm

1 stop13h 55m

Sofia

Tue 11/17

6:10 am-11:25 pm

2 stops25h 15m

$554

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/15

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Fri 11/6

6:10 am-1:55 pm

1 stop15h 45m

$556

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 4/13

2:40 pm-11:10 pm

2 stops24h 30m

Sofia

Tue 11/17

2:25 pm-3:30 pm

2 stops33h 05m

$558

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 4/12

7:45 am-6:10 pm

2 stops26h 25m

Sofia

Wed 11/4

6:10 am-1:55 pm

1 stop15h 45m

$562

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 4/12

3:30 pm-6:10 pm

1 stop18h 40m

Sofia

Thu 11/19

2:25 pm-3:30 pm

2 stops33h 05m

$566

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $886 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $791 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

18h 17m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 18h 17m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 18h 17m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $645Free CancellationRating
6.8
7,711 reviews
Search Lufthansa flights
United AirlinesPriceFrom $721Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines